Process for the manufacture of carbon electrodes or of pure retortcarbon



' No Drawing.

' use UNITED STATES PATENT OFFICE.

EMERICH SZARVASY, 0F BUDAPEST, HUNGARY.

" PROCESS FOR THE.MANUFACTURE OF CARBON ELECTRODES OR OF PURE RETQRT- CARBON.

To all wiw'mc't may concern Be it-lmownthat I, Ermine SZARVASY," citizen? of Hungary, q in Hungary, have invented 1 certain new and I 'fu'l Improvements in Processes for the- .Manufactureoft-Carbon@Electrodes or of kPurey RetortfCarbon (for which I have filed residing at Budapest,

an .agplication iri Hungary,Jan. 29, 1918,)

I of w i 19'io,';- has for its object a ichsthefol-lowing is anspecification. -My-Patent-Number 1,199,220 of Aprll 12, process for the manufacture ofientirely pure retort carbon by dissociation of methane, consisting of subjecting methane to thermal decomposition in such a mannerthat the body heated to the decomposing temperature consists itself of duced "If the thermal 0 cultand- 1 fragments containedchamber. but also the. will be heated to .the

Jresistfor a considerable time -temperatures to be applied with the exterpure retort carbon hav ng been propreviously by the same process.

decomposition is produced by external -lieatingy not only the carbon in the decomposing walls of said chamber dissociation temperature. 1 Therefore the carbon will be deposited at-t-he start on-the walls of the decomposing chamber forming a hard crust,

hardly re-movable without injuring the decomposing chamber. Besides it is very difiiexpensive to obtain decomposing" chambers consisting of a material able to to the high nal heating and enough resistant to allow 5 these difficulties the breaking of the hard carbon crust.

According to myinvention I overcome a 'tion of the decomposing tubeheated above the: dissociationtemperature of methane or 3 I. the whole, preferably tubular, decomposingchamber of pure retort carbon produced previously by the dissociation of methane by 1 I the same performed in the manner ,for instance .bon electrodes.

process, said carbon tubes or the manufactured by a method used or the manufacturing of carlike being The-decomposition of methane may be described in my former Patent No. 1,199,220 viz., by filling externally to the decom I Specification of Letters Patent,

carbon tube,

by forming at least theseclected outside of Patented Sept. 27, 1921.

Application filed June 3, 1920. Serial No. 386,410.

carbon fragments and partly on the inner surface of the carbon tube; By the carbondeposit formed onthe inner surface of the the cross section of this latter will be gradually reduced. lVhen this cross section is reduced so far that no efficient work is possible, the decomposition will be stopped, the'filling will be removed and the carbon tube. consisting of the same pure carbon :will be crushed together With said deposit and used in the wellknown manner partly for manufacturing decomposing tubes for further methane decomposition,

' While the'remaining carbon can be used for manufacturing carbon electrodes or for other purposes.

As the incandescent walls of the carbon tube form by themselves efiicient catalytic surfaces for the dissociation of methane, the

carbon fragment filling may be dispensed With. Howeverone may start the process with a filling of carbon fragments in the tube, and diminish the filling gradually as the cross section of the tube gets reduced, remove the filling totally. when the cross section becomes too narrow and continue the decompositionu'ntil the cross section of the tube is filled out completely or nearly so.

' \Vith well-known methods for example by diluting the methane with inert gases, by conducting the gas flow with a suitably high speed and by'using suitable temperatures it is possible to control the operation that one part of the carbon proceeding from the decomposition of methane will be carried off ;y the gases as soot and may be colthe decomposing chamber. lVhat I claim is:

l. A process for the manufacture of entirely pure retort carbon by the di sociation of methane, said process consisting in con ducting methane through a decomposiru, chamber heated by external heating abode the dissociation temperature of methane and composed, at the parts heated to said temperature, of produced by the same process, whereby carbon proceeding {from the decomposition over the glowing carbon fragments con-.

pure retort carbon previously of methane is deposed on the inner surface of the carbon walls of the decomposing chamber, crushing the carbon deposit together with the carbon walls of the decomsing chamber and using a part of the carn for composing chambers.

2. A process for the manufacture of entirelypure retort carbon by the dissociation of methane, said process consisting in conducting methane through a decomposing chamber heated by external heating above the dissociation temperature of methane andheated to said temure retort carbon, previously composed, at the parts perature, of produced b t e same process and containing a filling o retort carbon fragments, previously produced by the same process whereby carbon proceeding from the decomposition of methane is deposited on the carbon fragments and on the inner surface of the carbon walls of the decomposing chamber, crushing the carbon deposit together with the carbon walls of the decomposin chamber and using a part of the car 11 for manufacturing further carbon decomposing chambers;

3. A process for the manufacture of entirely pure retort carbon by the dissociation manufacturing further carbon de of methane, said process consisting in conducting methane through a decomposing chamber heated by external heating above the dissociation temperature of methane and composed, at the parts-heated to said temperature, of pure retort, carbon, previously produced'by thesame process, and containing a filling of retort carbon fragments, previously produced by the same process, whereby carbon proceeding from the decomposition of methane is deposed on the carbon fragments and on the inner surface of the carbon walls of the decomposing chamber, removing the carbon fragments and continuing the methane decomposition with the incandescent carbon walls of the decomposing. chamber as catalytic. agent crushing the carbon deposit together. with the carbon walls of the decomposing chamber and using a. part of the carbon for manufacturing further carbon decomposin gvchambers.

In testimony whereof I affix my signature in presence of tw witnesses.

EMERIC ALBVASY.

\Vitnesses: I

CHAS. Mnncrns, EUGENE Haasam. 

